python format spec for int.__format__
Question:
I have reason to want to call int.__format__ directly. I tried the following
>>> object.__format__(1,'d')
But get an exception
TypeError: unsupported format string passed to int.__format__
What should the fmt_spec be?
Answers:
Well, you used object.__format__ not int.__format__. Try one of these instead:
>>> int.__format__(1, 'd')
'1'
>>> (1).__format__('d')
'1'
The behaviour you’re seeing with non-empty string passed to object.__format__ is documented:
Changed in version 3.4: The __format__ method of object itself raises a TypeError if passed any non-empty string.
I have reason to want to call int.__format__ directly. I tried the following
>>> object.__format__(1,'d')
But get an exception
TypeError: unsupported format string passed to int.__format__
What should the fmt_spec be?
Well, you used object.__format__ not int.__format__. Try one of these instead:
>>> int.__format__(1, 'd')
'1'
>>> (1).__format__('d')
'1'
The behaviour you’re seeing with non-empty string passed to object.__format__ is documented:
Changed in version 3.4: The
__format__method of object itself raises aTypeErrorif passed any non-empty string.